EP1088673B1

EP1088673B1 - Ribbon cassette having engagement parts aiding cassette mounting and demounting

Info

Publication number: EP1088673B1
Application number: EP00127448A
Authority: EP
Inventors: Yoshikatsu c/o Bother Kogyo K. K. Kameyama
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 1997-01-07
Filing date: 1998-01-02
Publication date: 2003-05-07
Anticipated expiration: 2018-01-02
Also published as: DE69814476D1; DE69814476T2; EP0852183B1; JPH10193760A; EP0852183A3; DE69802018T2; DE69802018D1; EP0852183A2; JP3721684B2; US5984546A; US6079886A; EP1088673A1

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a ribbon cassette, and a printing apparatus and a facsimile apparatus each using the same.

2. Description of Related Art

Hitherto, it is known that in a printing apparatus used for a facsimile apparatus or the like, a ribbon cassette in which an ink ribbon is housed in a cassette case is used in order to make replacement of the ink ribbon for printing easy (refer to JP-A-7-283919, which forms the basis for the preamble of claim 1).
The ribbon cassette has a cylindrical ribbon supplying part for supplying an ink ribbon, a cylindrical ribbon take-up part for taking up the ink ribbon, and a connecting arm for connecting both of the parts. Printing is performed by a print head in a position while the ink ribbon is moved from the ribbon supplying part to the ribbon take-up part.
As shown in Figs. 11 and 12 casing 100A of such a ribbon cassette 100 is constructed by: main body parts 101A, 102A in which a ribbon supplying part 101 and a ribbon take-up part 102 are connected to connecting arms 103, 103; and lid members 101B, 102B which are connected to the main body parts 101A, 102A openably and closably. The ribbon supplying part 101A houses a supply roll 117 around which an ink ribbon 116 is wound. The ribbon take-up part 102A houses a take-up roll 118 for taking up the ink ribbon 116 supplied from the supply roll 117.
Further, in order to prevent the lid members 101B, 102B from being opened arbitrarily at the time of operation, the lid members 101B, 102B are provided with engaged parts 104, 104, 104, 104 and the main body parts 101A, 102A are provided with engagement parts 105, 105, 105, 105 which are detachably engaged with the engaged parts 104.
As shown in Fig. 11, the ink ribbon 116 is arranged so as to pass the inner sides of the engagement parts 105. The length h1 in the axial direction of the ribbon cassette 100 is longer than the width h2 of the ink ribbon 116.
The ribbon cassette 100 is loaded into a facsimile apparatus as follows. First, as shown in Fig. 13A, a lid member 111 is opened, two levers 113 on a main body casing 112 side are lifted to stand a print head 114. Then, as shown in Fig. 13B, the ink ribbon is tightened by rotating a ribbon roll (not shown) or the like so that the ink ribbon is in a tensed state. As shown in Fig. 13C, the ribbon cassette 100 is held and inserted by using an arrow 115 as a guide, and as shown in Fig. 13D, the ribbon cassette 100 is loaded into a predetermined position in the main body casing 112. Subsequently, as shown in Fig. 13E, a procedure for laying the print head 114 and closing the lid member 111 is performed.
According to the above-mentioned structure, however, the casing 100A of the ribbon cassette 100 has a shape in which the ribbon supplying part 101 and the ribbon take-up part 102 are connected by the elongated connecting arms 103 and which tends to be twisted and deformed. Consequently, when the ribbon cassette 100 is loaded into the main body casing 112A torsion force consequently acts on the ribbon cassette 100 depending on the way of holding the ribbon cassette 100, the ribbon cassette 100 is twisted and deformed. There is a possibility that the engagement between the engaged parts 104, 104 and the engagement parts 105, 105 is cancelled, the lid member 111 is opened, and the ink ribbon 116 is exposed. There is also a request that the ribbon cassette 100 is loaded as simple as possible.

SUMMARY OF THE INVENTION

In consideration of the above points, it is an object of the present invention to provide a ribbon cassette which can be easily loaded without being acted a torsion force when the cassette is loaded, and a printing device using the ribbon cassette.
In order to achieve the object, according to the present invention, there is provided a ribbon cassette having a ribbon supplying part for supplying an ink ribbon, a ribbon take-up part for taking up the ink ribbon, and a connecting part for connecting both of the parts, as is claimed in claim 1.
The engaged part may be provided near the hinge member of the main body casing of the printing device and has first and second engaged faces; and the engagement part may be provided near the ribbon take-up part or the ribbon supplying part positioning on the side near the hinge member and has a first engagement face which comes into contact with the first engaged face of the engaged part when the ribbon cassette is ejected, thereby forming the rotation center for cassette ejection.
Consequently, by holding and lifting holding parts of the ribbon cassette, the rotation center for cassette ejection is formed by the engagement relation between the first engaged face on the main body casing side and the first engagement face of the engagement part of the ribbon cassette, the cassette can be ejected not forcedly.
The engagement part may have a second engagement face which comes into contact with the second engaged face of the engaged part subsequent to the first engagement face, thereby forming another rotation center for cassette ejection when the ribbon cassette is ejected.
Consequently, even in a case where rotation with respect to the rotation center for cassette ejection formed by the engagement relation between the first engaged face on the main body casing side and the first engagement face of the engagement part of the ribbon cassette is insufficient, rotation around another rotation center for cassette ejection formed by the engagement relation between the second engaged face on the main body casing side and the first engagement face of the engagement part of the ribbon cassette is further performed, so that the ribbon cassette can be certainly ejected.
By holding and lifting holding parts, th rotation center for cassette ejection is formed by th engagement relation between the first engaged face of th engaged part on the main body casing side and the firs engagement face of the engagement part of the ribbo cassette, the cassette can be easily ejected.
Since another rotation center for cassette ejection is formed by the engagement relation between the second engaged face of the engaged part on the main body casing side and the second engagement face of the engagement part on the ribbon cassette side, even in a case where the rotation with respect to the rotation center for cassette ejection formed by the engagement relatior between the first engaged face on the main body casing side and the first engagement face of the engagement part on the ribbon cassette side is insufficient, the rotation around another rotation center for cassette ejection is performed and the ribbon cassette can be certainly ejected.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects and advantages of the invention will become apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a central longitudinal section showing the internal structure of a facsimile apparatus according to the invention;
Fig. 2 is a central longitudinal section showing the relation between a main body casing and a lid member of the facsimile apparatus;
Fig. 3 is a central longitudinal section showing the state where the lid member of the facsimile apparatus is opened;
Fig. 4 is a plan view of a state where a ribbon supplying part and a ribbon take-up part of a ribbon cassette are opened;
Fig. 5 is a right side elevational view of the same;
Fig. 6 is a left side elevational view of the same;
Fig. 7 is a plan view of the same;
Fig. 8 is a bottom view of the same;
Fig. 9 is a diagram explaining a procedure for loading a ribbon cassette according to the invention;
Fig. 10 is a detailed diagram of the same;
Fig. 11 is a plan view of a conventional ribbon cassette in a state where a lid member is open;
Fig. 12 is a central longitudinal section of the same; and
Figs. 13A-E are diagrams explaining a procedure for loading a conventional ribbon cassette.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

An embodiment of the invention will be described hereinbelow with reference to drawings.
Fig. 1 shows the internal structure of a facsimile apparatus. A facsimile apparatus 1 has a main body casing 2 having an opening 2A (refer to Fig. 3) in which a print head 3 is arranged in the opening 2A and a lid member 4 for closing the opening 2A of the main body casing 2 openably and closably.
In the lid member 4, a recording medium housing part 6 for housing a number of recording papers 5 in a stacked state and a recording medium conveying unit 8 for taking out the recording paper 5 from the recording medium housing part 6 and conveying it via the print head 3 to an ejecting part 7 as a space part above the lid member 4, for ejecting the printed recording paper 5 are integrally formed.
The recording medium conveying unit 8 of the lid member 4 has a paper feeding roller 11 for feeding the recording paper 5 from the recording medium housing part 6 one by one, a platen roller 12 provided opposite to the print head 3 on the main body casing 2 side, and an ejection roller 13 for ejecting the recording paper 5 to the ejection part 7 above the lid member 4. These rollers 11, 12 and 13 are sequentially arranged from the upstream side of the conveying direction. For smooth conveyance of the recording papers 5, the recording medium conveying unit 8 has also a U-shaped paper guide 14 arranged between the platen roller 12 and the ejection roller 13 and a pinch roller 15 provided in correspondence to the ejection roller 13. Although not specifically shown, the rollers 11, 12 and 13 are rotated by a motor for LF (Line Feed) via a gear mechanism.
The recording papers 5 stacked in the recording medium housing part 6 are fed from the recording medium housing part 6 to the platen roller 12 side one by one by the paper feeding roller 11 and an image such as characters, figures, and the like is recorded by the print head 3 via an ink ribbon 26A which will be described later in the position of the platen roller 12. The printed recording paper 5 is guided by the paper guide 14, passed through the pinch roller 15 and the ejection roller 13, and ejected to the ejection part 7 located above the recording medium housing part 6.
The tip of the recording paper 5 fed from the recording medium housing part 6 is detected by a sensor for detecting the recording paper tip (not shown) provided in correspondence to a paper conveyance path in the main body casing 2, and a printing timing by the print head 3 is determined on the basis of the detection signal. The ejecting part 7 also has a recording paper ejection sensor (not shown) for detecting the ejection of the recording paper 5. When a plurality of sheets of paper are continuously recorded (printed) and the recording paper ejection sensor detects that the recording paper 5 on which the image is recorded is completely ejected, the next recording paper 5 is fed from the recording medium housing part 6 by the paper feeding roller 11. With such control, paper jam is avoided.
As shown in Figs. 2 and 3, the lid member 4 is rotatably supported by the main body casing 2 around a rotation axis 21 as a rotation center. Further, the rotation angle of the lid member 4 with respect to the main body casing 2 is regulated by regulating means 22 in a predetermined range so that the recording paper 5 is not dropped from the recording medium housing part 4. The lid member 4 has a hinge member 23 that is rotatably supported by the main body casing 2 around the rotation axis 21.
Specifically, the regulating means 22 for regulating the rotational angle of the lid member 4 in a predetermined angle range has a guide hole 23A which is a circular arc shaped long hole opened in the hinge member 23 of the lid member 4 and an engagement pin member 24 which is movably engaged with the guide hole 23A opened on the main body casing 2 side.
In a state where the lid member 4 is closed, as shown in Fig. 2, the recording paper 5 and the horizontal plane has an angle α of about 60° so that the recording paper 5 is smoothly supplied. When the lid member 4 is opened, as shown in Fig. 3, the lid member 4 is turned by an angle β of about 40° around the rotation axis 21 while the opening operation of the lid member 4 is guided by the engagement relation between the guide hole 23A of the hinge member 23 and the engagement pin member 24 which form the regulating means 22. Although the recording paper 5 and the horizontal plane has accordingly an angle γ of about 20°, the further rotation of the lid member 4 is regulated and the lid member 4 is not opened more than that.
That is, the rotation angle of the lid member 4 with respect to the main body casing 2 for the horizontal plane is regulated within a range from 0° to about 40° by the regulating means 22 constructed by the guide hole 23A of the hinge member 23 and the engagement pin member 24. As a result of the regulation, the range of angle change of the recording medium housing part 6 for housing the recording paper 5 with respect to the horizontal plane is set in a range from about 60° to about 20°. Even in a state where the recording medium housing part 6 is closest to the horizontal state, the angle between the recording paper 5 and the horizontal plane is about 20°, so that the recording paper 5 is not dropped from the recording member housing part 6. The guide hole 23A has an engagement hole 23B. By engaging the engagement pin member 24 with the engagement hole 23B, the turn angle of the lid member 4 for the main body casing 2 with respect to the horizontal plane is maintained to the angle of about 40° (the maximum angle at which the recording paper 5 is not dropped from the recording medium housing part 6). Consequently, various works to the inside of the main body casing 2 can be performed while holding the lid member 4 in the most-widely opened state. It can be prevented that the lid member 4 is abruptly closed when such works are performed and the works are disturbed to be performed smoothly.
In addition to the print head 3, the main body casing 2 also comprises: control means 25 which has a reception buffer (not shown) for temporarily storing reception image information received via a communication line and controls the printing by the print head 3 on the basis of the reception image information; and a ribbon cassette 26 which houses the ink ribbon 26A having the width almost the same as the recording area width of the print head 3 for printing by the print head 3 and is set in a predetermined position in the opening 2A. Although not specifically shown, the control means 25 is constructed by a microcomputer including a CPU, a ROM, and a RAM, and the RAM has the above-mentioned reception buffer.
The print head 3 is constructed by a thermal head having a number of heater elements arranged in a line in the direction perpendicularly crossing the feeding direction of the recording paper 5. The number of heater elements is selectively heated based on signals (reception image information) supplied to the control means 25, the printing is performed onto the recording paper 5 via the ink ribbon 26A in the ribbon cassette 26, and an image of characters, figures, and the like is recorded.
Although not specifically shown, the main body casing 2 also has an operation panel having a liquid crystal display, a keyboard, and the like for executing various operations.
In the ribbon cassette 26, the ink ribbon 26A is housed in a casing 10 integrally made of polypropylene. The details are as shown in Figs. 4 to 8. The ribbon cassette 26 has a ribbon supplying part 27 for supplying the ink ribbon 26A, a ribbon take-up part 28 for taking up the ink ribbon 26A led from the ribbon supplying part 27 and passed between the print head 3 and the platen roller 12 and connecting parts 29 and 30 for connecting the parts 27 and 28.
The ribbon supplying part 27 has a supply part main body 27A connected to the connecting parts 29, 30 and a lid member 27B openably and closably connected to the supplying part main body 27A via a hinge part 27C (what is called a polypropylene (P.P.) hinge). While retained parts 31, 31 are provided on both of the right and left sides of the supply part main body 27A, retaining parts 32, 32 which detachably come into engagement with the retained parts 31 and retain the lid member 27B by the supply part main body 27A, are provided on both of the right and left side faces of the lid member 27B.
While the retained parts 31 are protrusions projecting sideward, the retaining parts 32 are provided via hinges 33, 33 (so-called P.P. hinges) on the other side faces of the lid member 27B and have engagement holes 32A, 32A with which the protrusions (retained parts 31) are detachably engaged.
The ribbon supplying part 27 has engaged parts 34A, 34B provided near the retained parts 31, and engagement projecting parts 35, 35 which are provided near the retaining parts 32, detachably engaged with the engaged parts 34A, 34B, and construct the engagement relation countering the force acting in the direction of releasing the retaining relation between the retained parts 31 and the retaining parts 32. With respect to the engaged parts 34A, 34B, although the engaged part 34A is formed on the inner wall face of the supply part main body 27A and the other engaged part 34B is formed on the inner wall face of the recessed part, they can also have the same shape.
Further, in a manner similar to the ribbon supplying part 27, the ribbon take-up part 28 has a take-up part main body 28A connected to the connecting parts 29, 30, and a lid member 28B openably and closably connected to the take-up part main body 28A via a hinge part 28C (so-called P.P. hinge). While retained parts 36, 36 are provided on both of the right and left side faces of the take-up part main body 28A, retaining parts 37, 37 which are detachably engaged with the retained parts 36 and retain the lid member 28B by the take-up part main body 28A are provided on both of the right and left side faces of the lid member 28B.
While the retained parts 36 are protrusions projecting sideward, the retaining parts 37 are provided on the side faces of the lid member 28B via hinge members 38, 38 and have engagement holes 37A, 37A with which the protrusions are detachably engaged. The ribbon take-up part 28 has an engagement recessed part 41 as an engaged part provided near the retained part 36, and an engagement projecting part 42 which is provided near the retaining part 37, detachably engaged with the engagement recessed part 41, and constructs the engagement relation countering the force acting in the direction of canceling the retaining relation of the retained part 36 and the retaining part 37. In this example, since the engaged part is the engagement recessed part 41 and the strong engagement relation is constructed with the engagement projecting part 42, the engagement relation between the engaged part and the engagement projecting part is formed only on one side face of the ribbon take-up part 28. However, similar engagement structures can be also provided on both of the right and left sides. In this case, in a manner similar to the ribbon supplying part 27, engagement structures which are different with respect to the right and left can be also constructed.
The connecting parts 29, 30 are provided with rectangular holding parts 43, 43 projectingly. The holding parts 43 are positioned near the ribbon take-up part 28 locating on the side far from the hinge member 23 although the holding part 43 has a rectangular shape, the shape is not limited to it. It is needless to say that various shapes can be used in consideration of function, layout, and the like.
Further, in the ribbon supplying part 27 bearings 27D, 27D for rotatably supporting a supply roll 44 for supplying the ink ribbon 26A are formed on the right and left side faces. In the ribbon take-up part 28 bearings 28D, 28D for rotatably supporting a take-up roll 45 for taking up the ink ribbon 26A are formed on the right and left side faces. The take-up roll 45 is rotated in the take-up direction by a motor (not shown) via a gear mechanism. The ink ribbon 26A is line-fed synchronously with the recording paper 5. By feeding the ink ribbon 26A and the recording paper 5 and pressure contacting of the ink ribbon 26A with the recording paper 5 by the print head 3, an image is recorded on the recording paper 5.
Further, as shown in Fig. 10A, while an engaged part 71 having first and second engaged faces 71A, 71B is provided near the roll bearing part of the supply roll 44 in the ribbon supplying part 27 in the main body casing 2A, a mountain-shaped engagement part 72 is provided near the ribbon supplying part 27 locating on the side near the hinge member 23. The engagement part 72 has a first engagement face 72A which comes into contact with the first engaged face 71A, 71B of the engaged part 71 to form the rotation center for ejecting the cassette when the ribbon cassette 26 is ejected. In addition to the first engagement face 72A, the engagement part 72 also has a second engagement face 72B which comes into contact with the second engaged face 71B of the engaged part 71 subsequent to the first engagement face 72A to form another rotation center for ejecting the cassette. The first engaged face 71A of the engaged part 71 extends almost in the horizontal direction and the second engaged face 71B extends almost in the vertical direction continuously from the first engaged face 71B.
As shown in Fig. 1, in the front upper part of the facsimile apparatus 1, an original feeding device 52 for feeding an original 71 at a constant speed and an original reading device 53 for reading an image recorded on the original 51 fed by the original feeding device 52 are arranged. A panel cover 54 positioned on the surface has an operation panel (not shown) for performing various operations regarding facsimile transmission and the like. The operation panel includes a liquid crystal display, a keyboard, and the like.
The original feeding device 52 has a feeding roller 55 for taking the original 51 in, a separating member 56 for separating the originals 51 which come into contact with the feeding roller 55 and are fed one by one, an ADF plate spring 57 for energizing the separating member 56 in the direction so as to come into contact with the feeding roller 55 and a paper ejecting roller 59 for feeding out the original 51 with a roller 58. On the other hand, the original feeding device 53 has a small read sensor 61 (CIS) held in the main body casing 2 via a holder 60 and a white platen roller 62 provided opposite to the read sensor 61.
When the originals 51 to be transmitted are put on an original receiving part 63 which is covered, it is detected by a sensor for detecting original (not shown) and the originals 51 are certainly separated one by one by the separating member 56 and the feeding roller 55 and the original 51 is fed to the original reading position where the read sensor 61 is arranged. The sensor for detecting the original is constructed by two sensors for detecting the presence and absence of the original 51 and also detecting whether the size of the original 51 is B4, A4, or letter sized.
The image recorded on the original 51 is optically read by the read sensor 61 in the original reading position. The read original 51 is fed by the roller 58 and the paper ejecting roller 59 and finally ejected in front of the facsimile apparatus 1.
In the facsimile apparatus, therefore, when the ribbon cassette 26 is inserted into the opening 2A of the main body casing 2 as shown in Fig. 9A, the take-up roll 45 is rotated first and the ink ribbon is in a tensed state, the holding parts 43, 43 are held and the ribbon cassette 26 is inserted into the main body casing 2 by using the arrow as a guide as shown in Fig. 9B. Then, as shown in Fig. 9C, while holding the holding parts 43, the ribbon cassette 26 is downwardly displaced and is set in a predetermined position, that is, a position where the shaft of the supply roll 44 is engaged with the roll bearing, and after that, the lid member 4 is closed as shown in Fig. 9D.
On the other hand, when the ribbon cassette 26 is taken out, the holding parts 43 of the ribbon cassette 26 are held by both hands and lifted upward. By the lifting, when the ribbon cassette 26 is detached by holding the holding parts 43, the rotation center is changed by the engagement relation between the engagement part 72 on the ribbon cassette 26 side and the engaged part 71 on the bearing member 50 side of the main body casing 2. Thus, even when the opening angle of the lid member 4 with respect to the opening 2A of the main body casing 2 is small, the ribbon cassette can be detached easily.
That is, when the holding parts 43 of the ribbon cassette 26 are held and the ribbon take-up part 28 side is lifted upward, as it is changed from the state shown in Fig. 10A to Fig. 10B, the engagement part 72 is climbed on the first engaged face 71A of the engaged part 71 and the rotation center of the ribbon cassette 26 is changed from the roll axis of the supply roll 44 to the part in which the first engagement face 72A of the engagement part 72 and the first engagement face 71A of the engaged part 71 are in contact. Even if the opening angle of the lid member 4 is small, the ribbon cassette 26 is largely risen and is easily ejected. Further, when the ribbon take-up part 29 side is lifted, as shown in Fig. 10C, the second engagement face 72B of the engagement part 72 comes into contact with the second engaged face 71B of the engaged part 71 and the rotation center of the ribbon cassette 26 is changed to the contacting part of them. The ribbon cassette 26 is largely risen and is ejected more easily.
By constructing as mentioned above, since the holding parts 43 are projectingly provided on the connecting parts 29, 30 for connecting the ribbon supplying part 27 and the ribbon take-up part 28 by holding the holding parts 43 with both hands, the cassette can be easily attached or detached without acting an unnatural force such as a torsion force or the like to the ribbon cassette 26. Thus, the lid members 27B, 28B for the ribbon supplying part 27 and the ribbon take-up part 28 are not abruptly opened when the ribbon cassette 26 is attached or detached.
Moreover, since such holding parts 43 are provided near the ribbon take-up part 28, the ribbon cassette 26 is attached or detached by holding the holding parts 43 positioning near the ribbon take- up part 28 which is relatively heavy, so that the operations can be stably performed.
Especially, since such holding parts 43 are arranged away from both the ribbon supplying part 27 and the hinge member 23, and the ribbon take-up part 28 is positioned on the side far from the hinge member 23, the ribbon cassette 26 can be easily attached or detached to/from the facsimile apparatus 1 by holding the holding parts 43 irrespective of the opening state of the lid member 4. Consequently, in case of a layout in which the ribbon supplying part of the ribbon cassette is positioned on the side far from the hinge member 23 for opening and closing the main body casing with the lid member in a manner different from the foregoing example, it is desirable to provide holding parts as mentioned above near the ribbon supplying part.
Further, by holding and lifting the holding parts 43 with both hands, the rotation center for ejecting the cassette is formed by the engagement relation between the first engaged face 71A of the engagement part 71 on the main body casing 2 side and the first engaged face 71A of the engagement part 71 of the ribbon cassette 26. Consequently, the cassette can be easily ejected.
In addition, another rotation center for cassette ejection is formed by the engagement relation between the second engaged face 71B of the engaged part 71 on the main body casing 2 side and the second engagement face 72B of the engagement part 72 of the ribbon cassette 26. Even in a case where rotation with respect to the rotation center for cassette ejection formed by the engagement relation between the first engaged face 71A on the main body casing 2 side and the first engagement face 72A on the ribbon cassette 26 side is insufficient, the rotation around another rotation center for cassette ejection is performed, so that the ribbon cassette 26 can be certainly ejected.
Although the example of applying the invention to the facsimile apparatus has been described in the foregoing embodiment,
The invention can be also similarly applied to a printing apparatus which does not have an original reading function but has a recording medium housing part and a recording medium conveying part for ejecting a recording medium from the recording medium housing part and conveying via a print part to an ejecting part for ejecting the printed recording medium.

Claims

A ribbon cassette (26) comprising:

a ribbon supplying part (27) that supplies an ink ribbon (26A);

a ribbon take-up part (28) that takes up the ink ribbon (26A); and

a connecting part (29, 30) that connects the supplying and take-up parts (27,28), the ribbon cassette (26) being detachably installed in a printing device (1),
characterized in that the connecting part (29,30) further comprising an engagement part (72) provided adjacent one of the ribbon supplying part and the ribbon take-up part (27,28),

the engagement part (72) being engageable with an engaged part (72) provided in the printing device (1) to shift a rotation center of the ribbon cassette (26) from a selected axis of one of a supply roll axis and a take-up roll axis to a position on an axis of the engagement part (72) when the ribbon cassette (26) is installed in or ejected from the printing device (1).
The ribbon cassette (26) according to claim 1, wherein the rotation center is formed adjacent to the selected axis of one of the supply roll axis and the take-up roll axis, and wherein rotation of the ribbon cassette about the rotation center causes leveraged movement of a portion of the ribbon cassette (26), where the selected axis is positioned, away from the printing device (1) when the ribbon cassette (26) is ejected from the printing device (1).
The ribbon cassette according to claim 1 or 2, wherein said engagement part (72) has a first engagement part and a second engagement part.
The ribbon cassette according to claim 3, wherein said engaged part (71) has a first engaged part and a second engaged part, and wherein each of said first and second engagement parts and said first and second engaged parts has a face (72A, 72B, 71A, 71B), the face (72A) of the first engagement part coming into contact with the face (71A) of the first engaged part, and the face (72B) of the second engagement part coming into contact with the face (71B) of the second engaged part when the ribbon cassette (26) is installed in or ejected from the printing device (1).
The ribbon cassette according to claim 4, wherein the face (72A) of the first engagement part and the face (71A) of the first engaged part initially contact each other, and then the face (72B) of the second engagement part and the face (71B) of the second engaged part contact each other when the ribbon cassette (26) is ejected from the printing device (1).
The ribbon cassette according to claim 4, wherein the face (72B) of the second engagement part and the face (71) of the second engaged part initially contact each other, and then the face (72A) of the first engagement part and the face (71A) of the first engaged face contact each other when the ribbon cassette (26) is installed in the printing device (1).
The ribbon cassette according to claim 1 or 2, wherein said engagement (72) part has a first engagement part and a second engagement part and said engaged part (71) has a first engaged part and a second engaged part, and each of said first and second engagement parts and said first and second engaged parts has a face (72A,72B,71A,71B), the face (72A) of the first engagement part coming into contact with the face (71A) of the first engaged part to form a first center of rotation for the ribbon cassette (26), and the face (72B) of the second engagement part coming into contact with the face (71B) of the second engaged part when the ribbon cassette (26) is installed in or ejected from the printing device (1) to form a second center of rotation for the ribbon cassette (26).
The ribbon cassette according to claim 1 or 2, wherein the rotation center being offset from both the supply roll axis and the take-up roll axis to an axis of the engagement part (72).
A printing device (1) comprising a ribbon cassette (26) as claimed in one of claims 1 to 8.